| Share
 

ammonium group

ammonium group, in chemistry, a positively charged nitrogen atom joined by single bonds to four other atoms or groups. The simplest ammonium group, NH4+, is formed by protonation of ammonia, NH3, e.g., by its reaction with hydrogen chloride, HCl, to form ammonium chloride, NH4Cl, an ammonium compound. Organic ammonium compounds are formed by the reaction of an alkyl halide with an amine (see amino group), for example, ethyl chloride, C2H5Cl, reacts with triethylamine, (C2H5)3N, to form tetraethyl ammonium chloride, (C2H5)4N+Cl - . They are also formed by reaction of an amine with a mineral acid or by reaction of an alkyl halide with ammonia.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on ammonium group from Infoplease:

See more Encyclopedia articles on: Organic Chemistry


Premium Partner Content
HighBeam Research
Documents Images and Maps Reference
(from Newspapers, Magazines, Journals, Newswires, Transcripts and Books)

Research our extensive archive of more than 80 million articles from 6,500 publications.

Additional search results provided by HighBeam Research, LLC. © Copyright 2005. All rights reserved.

24 X 7

Private Tutor

Click Here for Details
24 x 7 Tutor Availability
Unlimited Online Tutoring
1-on-1 Tutoring